“What we see happening with this Republican strategy is a willingness to threaten the very foundation of the world’s greatest economic power, the economy that basically stabilizes the entire world economic system, and that is a very risky proposition,” Carney said on MSNBC’s “Morning Joe.”

Carney said the fear is that the government shutdown is “the trailer to a movie” of the strategy Republicans are going to apply to the upcoming debt ceiling, which the U.S. will reach on Oct. 17.